The World Health Organization has warned that there is no evidence yet that recovered COVID-19 patients cannot be reinfected. This warning was issued in a scientific brief as it confirmed cases of coronavirus worldwide has reached 2.8million.

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“Some governments have suggested that the detection of antibodies to SARS-CoV-2, the virus that causes COVID-19, could serve as the basis for an ‘immunity passport’ or ‘risk-free certificate’ that would enable individuals to travel or to return to work assuming that they are protected against reinfection,  there is currently no evidence that people who have recovered from COVID-19 and have antibodies are protected from a second infection,” the WHO said in a statement.